US20160088535A1 - Communication method and communication apparatus - Google Patents

Communication method and communication apparatus Download PDF

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Publication number
US20160088535A1
US20160088535A1 US14/889,104 US201414889104A US2016088535A1 US 20160088535 A1 US20160088535 A1 US 20160088535A1 US 201414889104 A US201414889104 A US 201414889104A US 2016088535 A1 US2016088535 A1 US 2016088535A1
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Prior art keywords
base station
terminal
communication
network
download
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Taisei Suemitsu
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Assigned to MITSUBISHI ELECTRIC CORPORATION reassignment MITSUBISHI ELECTRIC CORPORATION CORRECTIVE ASSIGNMENT TO CORRECT THE CORRESPONDENT DATA PREVIOUSLY RECORDED ON REEL 036962 FRAME 0682. ASSIGNOR(S) HEREBY CONFIRMS THE ASSIGNMENT. Assignors: SUEMITSU, TAISEI
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/00837—Determination of triggering parameters for hand-off
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24—Cell structures
    • H04W16/32—Hierarchical cell structures
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/04—Reselecting a cell layer in multi-layered cells
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/26—Reselection being triggered by specific parameters by agreed or negotiated communication parameters

Definitions

  • the present invention relates to a communication technology, and for example, is applied to communication between a plurality of base station apparatuses and a mobile station apparatus, such as LTE (Long Term Evolution) and LTE advanced.
  • LTE Long Term Evolution
  • LTE advanced Long Term Evolution advanced
  • Non-Patent Documents 1 and 2 define handovers between two different base stations (URL: http://www.3gpp.org/ftp/Specs/archive/36_series/36.300/36300-b50.zip, http://www.3gpp.org/ftp/Specs/archive/36_series/36.331/36331-a30.zip, accessed Apr. 24, 2013).
  • Patent Documents 1 and 2 it is presented in Patent Documents 1 and 2 that in a system environment in which the area of a microcell is located within the area of a macro cell, the macro cell accommodates channels for lower rate transmission, and the micro cell accommodates channels for higher rate transmission.
  • Patent Documents 3 to 14 present communication between a mobile station and a base station.
  • Patent Document 1 Japanese Patent Application Laid-Open No. 2001-339770
  • Patent Document 2 Japanese Patent Application Laid-Open No. 2001-346265
  • Patent Document 3 Japanese Patent Application Laid-Open No. 2011-61464
  • Patent Document 4 Japanese Patent No. 4838483
  • Patent Document 5 Japanese Patent No. 4303587
  • Patent Document 6 Japanese Translation of PCT International Application Publication No. 2004-536533
  • Patent Document 7 WO 07/015552
  • Patent Document 8 Japanese Patent Application Laid-Open No. 2009-162771
  • Patent Document 9 Japanese Patent No. 5051857
  • Patent Document 10 Japanese Translation of PCT International Application Publication No. 2010-531626
  • Patent Document 11 Japanese Translation of PCT International Application Publication No. 2011-526442
  • Patent Document 12 Japanese Translation of PCT International Application Publication No. 2012-517190
  • Patent Document 13 Japanese Translation of PCT International Application Publication No. 2012-517191
  • Patent Document 14 WO 12/093582
  • Non-Patent Document 1 3rd Generation Partnership Project (3GPP) “TS36.300”, V11.5.0, 2013.3
  • Non-Patent Document 2 3rd Generation Partnership Project (3GPP) “TS36.331”, V11.3.0, 2013.3
  • Patent Documents 3 to 14 a macro cell and a small cell do not coexist while occupying different transmission rates. Besides, none of these documents teaches speeding up of a handover.
  • the present invention has an object to switch, at high speed, a base station being a communication apparatus that is transited when a terminal communicates with a network.
  • a first aspect of a communication method according to the present invention is a communication method in a communication system including a network, a first base station, a second base station, and a terminal connectable to the network via any of the first base station and the second base station.
  • the communication method includes the steps of: (a) issuing, by the terminal being connected to the network via the first base station and not being connected to the second base station, a reception request for requesting a download of data to the first base station; (b) determining, by the first base station, whether or not to connect the terminal to the second base station correspondingly to the reception request; (c) causing, by the first base station, the second base station to admit that the terminal is to be connected to the second base station when the determination of the step (b) is affirmative; (d) after the step (c), transmitting, by the terminal, a notification indicating that communication between the terminal and the second base station is enabled to the second base station; and (e) after the step (d), after the terminal has completed the download, enabling, by the first base station, communication from the network via the first base station without determining whether or not to connect the terminal to the first base station.
  • a second aspect of the communication method according to the present invention further includes the following step (t) in the first aspect.
  • step of (f), after the step (d), upon completion of the download within a predetermined period, enabling the communication from the network via the first base station without releasing information on the terminal from the first base station, is further included.
  • a third aspect of the communication method according to the present invention further includes, in the first or second aspect, the step of (g) after the step (d), releasing the information on the terminal from the first base station when the download has not been completed within a predetermined period.
  • a communication area of the first base station is larger than a communication area of the second base station.
  • a transmission rate of the second base station is higher than a transmission rate of the first base station.
  • communication of the terminal with both of the first base station and the second base station is radio communication, and a value of a frequency used in the radio communication performed between the terminal and the first base station differs from a value of a frequency used in the radio communication performed between the terminal and the second base station.
  • a capacity of the data requested in the step (a) is notified from the network to the first base station, and connecting the terminal to the second base station is decided when the capacity of the data is greater than a predetermined value.
  • a first aspect of a communication apparatus is a communication apparatus being a base station involved in communication between a network and a terminal.
  • the terminal is communicable with the network also via another base station.
  • the communication apparatus includes: a routing unit that requests, from the network, establishment of a communication path from the network to the communication apparatus; and a download completion monitoring unit that monitors whether or not the terminal has completed a download of data from the network via the base station and, when deciding that the download has been completed before a lapse of a predetermined period of time from the establishment, requests a handover to the other base station without requesting the other base station to release user information of the terminal.
  • a second aspect of a communication apparatus is a communication apparatus being a base station involved in communication between a network and a terminal.
  • the terminal is communicable with the network also via another base station.
  • the communication apparatus includes: a routing unit that requests, from the network, establishment from the network to the communication apparatus; and a download completion monitoring unit that monitors whether or not the terminal has completed a download of data from the network via the base station and, triggered by a decision that the download has been completed, requests a handover to the other base station.
  • a third aspect of a communication apparatus is a communication apparatus being a base station involved in communication between a network and a terminal.
  • the terminal is communicable with the network also via another base station.
  • the communication apparatus includes: a routing unit that requests, from the network, a process of causing a communication path from the network to the terminal to transit the other base station; a download completion monitoring unit that monitors whether or not the terminal has completed a download of data from the network via the base station; and a user information managing unit that requests, when deciding that a predetermined period of time has elapsed since the process before the download is completed, the other base station to release user information of the terminal.
  • a fourth aspect of a communication apparatus is a communication apparatus being a base station involved in communication between a network and a terminal, and the communication apparatus includes a data capacity acquiring unit that obtains, triggered by receipt of a reception request from the terminal for requesting reception of data from the network, information on a capacity of the data from the network; and a handover deciding unit that decides whether or not to cause the terminal to be connected to another base station on the basis of the capacity of the data.
  • the process for enabling communication from the network via the first base station is started quickly.
  • the process for enabling communication from the network via the first base station is performed quickly.
  • the process of the second base station can be dedicated to the process for the communication requiring a high transmission rate, while the first base station can be dedicated to the process for the communication requiring a low transmission rate.
  • the radio communication performed at high transmission rate with high power is less likely to interfere with the radio communication performed at low transmission rate with low power.
  • the first aspect of the communication apparatus according to the present invention contributes to the realization of the first and second aspects of the communication method according to the present invention.
  • the second aspect of the communication apparatus according to the present invention contributes to the realization of the first aspect of the communication method according to the present invention.
  • the third aspect of the communication apparatus according to the present invention contributes to the realization of the third aspect of the communication method according to the present invention.
  • the fourth aspect of the communication apparatus according to the present invention contributes to the realization of the seventh aspect of the communication method according to the present invention.
  • FIG. 1 is a view explaining a communication system according to a first embodiment.
  • FIG. 2 is a view explaining a communication system according to a second embodiment.
  • FIG. 3 is a block diagram showing the configuration of a first base station according to a fifth embodiment.
  • FIG. 4 is a block diagram showing the configuration of a second base station according to the fifth embodiment.
  • FIG. 1 is a view explaining a communication system according to a first embodiment.
  • a user terminal UE for example, User Equipment referred to in 3GPP TS36.300
  • a first base station eNB and a second base station eNB for example, both of which are E-UTRAN Nodes B referred to in 3GPP TS36.300
  • the user terminal UE is connectable to a network via any of the first base station eNB and the second base station eNB.
  • Illustrated here as the network is a core network MME/S-GW.
  • the core network MME/S-GW has a configuration in which, for example, the MME (Mobility Management Entity) and S-GW (Serving Gateway) referred to in 3GPP TS36.300 are recognized as a whole.
  • both of the first base station eNB and the second base station eNB are connected to the same core network MME/S-GW (Intra-MME).
  • MME/S-GW core network MME/S-GW
  • these core networks MME/S-GW may be recognized as a network as a whole.
  • similar effects can be achieved in a similar manner.
  • Step S 91 the user terminal UE is connected to the core network MME/S-GW via the first base station eNB and is not connected to the second base station eNB.
  • Step S 91 the user terminal UE notifies the first base station eNB of a data reception request (download request).
  • Step S 92 the first base station eNB notifies the core network MME/S-GW of a download request.
  • the core network MME/S-GW obtains information on the capacity (data capacity) of the data being a target for the download from the Internet network (not shown). Then, in Step S 93 , the core network MME/S-GW notifies the first base station eNB of this.
  • Step S 03 the first base station eNB decides whether to perform a handover to the second base station eNB (for example, HO decision referred to in 3GPP TS36.300).
  • Step S 04 the first base station eNB notifies the second base station eNB of a handover request (for example, HO Request referred to in 3GPP TS36.300).
  • the user terminal UE downloads the data from the core network MME/S-GW via the first base station eNB.
  • Step S 03 does not necessarily need to be performed on the basis of the data capacity in Steps S 91 , S 92 , and S 93 .
  • a process described below is also applicable to a case where, while the user terminal UE is connected to the core network MME/S-GW via the first base station eNB, the user terminal UE is temporarily connected to the core network MME/S-GW via the second base station eNB due to another event, and then, the user terminal UE is again connected to the core network MME/S-GW via the first base station eNB.
  • Step S 05 on the basis of Step S 04 , the second base station eNB configures parameters such as user information (for example, UE Context referred to in 3GPP TS36.300), so that admission control (for example, Admission Control referred to in 3GPP TS36.300) to admit the connection of the user terminal UE to the second base station eNB is performed.
  • user information for example, UE Context referred to in 3GPP TS36.300
  • admission control for example, Admission Control referred to in 3GPP TS36.300
  • Steps S 04 , S 05 , and S 06 can accordingly be recognized as the steps in which, when a handover is decided to be performed in Step S 03 , the first base station eNB causes the second base station eNB to admit that the user terminal UE is to be connected to the second base station eNB.
  • Step S 06 the second base station eNB notifies the first base station eNB of an affirmative response (for example, HO Request Ack referred to in 3GPP TS36.300) to the handover request.
  • an affirmative response for example, HO Request Ack referred to in 3GPP TS36.300
  • Step S 07 on the basis of Step S 06 , the first base station eNB notifies the user terminal UE of a message (for example, RRC Connection Reconfiguration referred to in 3GPP TS36.300) to perform a reconfiguration for communication with the second base station eNB.
  • a message for example, RRC Connection Reconfiguration referred to in 3GPP TS36.300
  • the first base station eNB also forwards the data to the second base station eNB (for example, Data Forwarding referred to in 3GPP TS36.300).
  • Step S 09 the user terminal UE establishes synchronization (for example, Synchronization referred to in 3GPP TS36.300) conduction with the second base station eNB. This is performed, for example, via the RACH (Random Access Channel) conduction referred to in 3GPP S36.300.
  • synchronization for example, Synchronization referred to in 3GPP TS36.300
  • RACH Random Access Channel
  • Step S 11 further, the user terminal UE notifies the second base station eNB of a message (for example, RRC Connection Reconfiguration Complete referred to in 3GPP TS36.300) indicating that the reconfiguration of the communication (which enables communication between the user terminal UE and the second base station eNB) has been completed.
  • a message for example, RRC Connection Reconfiguration Complete referred to in 3GPP TS36.300
  • Step S 12 on the basis of the notification of Step S 11 , the second base station eNB notifies the core network MME/S-GW that the handover has been performed (for example, Path Switch Request referred to in 3GPP TS36.300).
  • FIG. 1 shows that the download is after Step S 12 , the download may be before Step S 12 .
  • Step S 16 in response to Step S 12 , the core network MME/S-GW notifies the second base station eNB of an affirmative response (for example, Path Switch Request Ack referred to in 3GPP TS36.300) to the request of Step S 12 .
  • an affirmative response for example, Path Switch Request Ack referred to in 3GPP TS36.300
  • 3GPP TS36.300 the first base station eNB is caused to release UE Context above after Path Switch Request Ack corresponding to Step S 16 .
  • 3GPP TS36.300 and TS36.331 do not take into account a download before the completion (Handover Completion) of a handover sequence (handover procedure).
  • the user terminal UE which has been connected to the core network MME/S-GW via the first base station eNB before the download request of Step S 91 , is connected to the core network MME/S-GW via the second base station eNB for a download, so to speak, temporarily in Steps S 09 , S 11 , and S 12 .
  • the user terminal UE is connected, as it was, to the core network MME/S-GW via the first base station eNB.
  • the above-mentioned switching of base station eNBs transited when the user terminal UE is connected to the core network MME/S-GW is desirably performed at high speed.
  • the second base station eNB does not allow the first base station eNB to release the user information until a predetermined period elapses thereafter.
  • This enables the first base station eNB to quickly perform admission control (for example, Admission Control referred to in 3GPP TS36.300) for causing connection via itself between the user terminal UE and the core network MME/S-GW.
  • Admission Control for example, Admission Control referred to in 3GPP TS36.300
  • FIG. 1 shows the case in which the user terminal UE notifies in Step S 94 that a download of the data corresponding to Step S 91 has been completed until a predetermined period elapses after the reception of the message of Step S 11 by the second base station eNB.
  • the user terminal UE is connected, as it was, to the core network MME/S-GW via the first base station eNB.
  • the second base station eNB accordingly notifies the first base station eNB of a handover request (for example, HO Request referred to in 3GPP TS36.300) triggered by receipt of the notification of Step S 94 (Step S 24 ) without deciding whether to perform a handover as executed by the first base station eNB in Step S 03 .
  • a handover request for example, HO Request referred to in 3GPP TS36.300
  • the process proceeds while the decision about whether to perform a handover is not performed as described above, thereby expediting the start of the process of quickly switching base station eNBs transited when the user terminal UE is connected to the core network MME/S-GW.
  • Step S 25 on the basis of Step S 24 , the first base station eNB configures parameters such as user information (for example, UE Context referred to in 3GPP TS36.300), so that admission control (for example, Admission Control referred to in 3GPP TS36.300) to admit that the user terminal UE is to be connected to the first base station eNB is performed.
  • user information for example, UE Context referred to in 3GPP TS36.300
  • admission control for example, Admission Control referred to in 3GPP TS36.300
  • Step S 26 the first base station eNB notifies the second base station eNB of an affirmative response (for example, HO Request Ack referred to in 3GPP TS36.300) to the handover request, as in Step S 06 .
  • an affirmative response for example, HO Request Ack referred to in 3GPP TS36.300
  • Step S 27 on the basis of Step S 26 , the second base station eNB notifies the user terminal UE of a message (for example, RRC Connection Reconfiguration referred to in 3GPP TS36.300) to perform a reconfiguration for communication with the first base station eNB, as in Step S 07 .
  • a message for example, RRC Connection Reconfiguration referred to in 3GPP TS36.300
  • the second base station eNB forwards the data to the first base station eNB (for example, Data. Forwarding referred to in 3GPP TS36.300).
  • the user terminal UE has completed a download via the second base station eNB.
  • the forwarding is accordingly limited, unlike the forwarding performed after Step S 07 .
  • Step S 29 the user terminal UE establishes synchronization (for example, Synchronization referred to in 3GPP TS36.300) with the first base station eNB, as in Step S 09 . This is performed, for example, via the RACH (Random Access Channel) conduction referred to in 3GPP TS36.300.
  • synchronization for example, Synchronization referred to in 3GPP TS36.300
  • RACH Random Access Channel
  • Step S 31 further, the user terminal UE notifies the first base station eNB of a message (for example, RRC Connection Reconfiguration Complete referred to in 3GPP TS36.300) indicating that the reconfiguration of communication has been completed, as in Step S 11 .
  • a message for example, RRC Connection Reconfiguration Complete referred to in 3GPP TS36.300
  • Step S 32 on the basis of the notification of Step S 31 , the first base station eNB issues a request (for example, Path Switch Request referred to in 3GPP TS36.300) regarding a routing configuration to the core network MME/S-GW, as in Step S 12 .
  • a request for example, Path Switch Request referred to in 3GPP TS36.300
  • Step S 32 the core network MME/S-GW performs the process of changing its communication path, from the second base station eNB to the first base station eNB (for example, Switch DL path referred to in 3GPP TS36.300, which is omitted in FIG. 1 ).
  • Step S 36 further, the core network MME/S-GW further notifies the first base station eNB of an affirmative response (for example, Path Switch Request Ack referred to in 3GPP TS36.300) to the request of Step S 32 , as in Step S 16 .
  • an affirmative response for example, Path Switch Request Ack referred to in 3GPP TS36.300
  • the communication from the core network MME/S-GW via the first base station eNB is enabled.
  • Step S 37 the first base station eNB notifies the second base station eNB that the second base station eNB is requested to release the user information (for example, UE Context Release referred to in 3GPP TS36.300). This causes the second base station eNB to release the user information (for example, Release Resources referred to in 3GPP TS36.300) in Step S 38 .
  • the user information for example, UE Context Release referred to in 3GPP TS36.300.
  • Step S 94 When Step S 94 is executed within a predetermined period after the execution of Step S 11 , in addition to the decision as to whether a handover is required in the second base station eNB, Steps S 24 and S 27 can be omitted. This is because the user information has not been released from the first base station eNB yet.
  • the omission of Step S 24 leads to the omission of Steps S 25 and S 26 .
  • the omission of Step S 27 leads to the omission of Step S 31 .
  • the first base station eNB can execute Step S 29 while not receiving the message of Step S 27 from the second base station eNB after Step S 94 , as long as it is not instructed to release the user information by the second base station eNB.
  • Such omission of steps expedites the execution of Step S 32 , contributing to quick switching of base station eNBs transited when the user terminal UE is connected to the core network MME/S-GW.
  • a second embodiment adopts the operations from Steps S 91 to S 16 described in the first embodiment.
  • the second embodiment thus omits the description of those steps.
  • the embodiment describes the process when Step S 94 is not executed within a predetermined period after the execution of Step S 11 .
  • FIG. 2 is a view explaining a communication technology according to the second embodiment, which omits the illustration of the processes from Steps S 91 to S 09 and the processes of Steps S 12 and S 16 and Step S 24 and its subsequent steps.
  • the second base station eNB waits for a predetermined period of time in Step S 30 after being notified of the message (for example, RRC Connection Reconfiguration
  • Step S 30 may be started before or after Steps S 12 and S 16 .
  • Step S 30 may be started with Step S 11 as a trigger.
  • the process described in the first embodiment is the process when Step S 94 is executed during the waiting in Step S 30 .
  • Steps S 17 and S 18 are executed after a lapse of the predetermined period of time.
  • the second base station eNB notifies the first base station eNB that the first base station eNB is requested to release the user information, as in Step S 37 . Consequently, in Step S 18 , the first base station eNB releases the user information, as in Step S 38 .
  • Executing Steps S 17 and S 18 to release the user information registered with the first base station eNB only after the waiting in Step S 30 without the execution of Step S 94 is desirable in the following respect. Specifically, for a short period of time required for downloading the data desired by the user terminal UE, the first base station eNB does not release the user information and quickly executes or does not require Step S 25 in the first embodiment; for a long period of time required for the downloading, the first base station eNB releases the user information, thereby preventing a reduction in the traffic capacity of the first base station eNB.
  • Step S 30 can be recognized as a timer function referred to as a UE context Release timer.
  • the communication areas (also referred to as “cells”) covered by the first base station eNB and the second base station eNB are large or small is not identified.
  • setting the cell of the first base station eNB to be larger than the cell of the second base station eNB makes the advantages of the first and second embodiments more conspicuous.
  • the first base station eNB corresponds to a macro cell
  • the second base station eNB corresponds to a small cell
  • the first base station eNB connects more user terminals UE to the core network MME/S-GW than the second base station eNB does.
  • traffic capacity is reduced if an increasing number of user terminals UE issue a download request of Step S 91 to the core network MME/S-GW.
  • the base station eNB involved in the connection between the user terminal UE that has requested a download and the core network MME/S-GW is changed (handover) from the first base station eNB to the second base station eNB.
  • the second base station eNB can be connected to limited user terminals that need high-rate transmission by issuing a download request, without the use of special identification information.
  • the process of the second base station eNB is dedicated to the process for the communication that needs a high rate transmission rate, while the first base station eNB is dedicated to the process for the communication that needs a low transmission rate. This allows the connection to the second base station eNB to be promptly handed over to a user that needs a high transmission rate.
  • the communication of the user terminal UE with both of the first base station eNB and the second base station eNB is radio communication
  • preferentially scheduling a user terminal UE, which has issued a download request, to communication of high transmission rate may lead to an unfair situation: the user terminal UE occupies the traffic of the base station eNB.
  • a handover performed as in the first and second embodiments can mitigate such unfair scheduling.
  • the cell of the first base station eNB be larger than the cell of the second base station eNB and that the transmission rate of the second base station eNB be higher than the transmission rate of the cell of the first base station eNB.
  • the reason for this is as follows: as suggested in Patent Document 1, the power required for communication of high transmission rate becomes higher, but a smaller cell can prevent an increase in the power. Additionally, the transmission rate in communication of the first base station eNB is low, and the power required for the communication is low, thereby enabling communication with a large number of user terminals UE in a large cell. Such a reduction in power consumption also contributes to the miniaturization of the first base station eNB and the second base station eNB.
  • Communication connection with the small cell is preferentially allocated to the user in need of high-rate transmission, so that the user can efficiently obtain high-capacity communication service.
  • the communication of the macro cell is mainly transmitted at low rate, allowing more users to be accommodated. Additionally, the interference associated with high-rate transmission by another user or the influence of scheduling allocation is reduced, enabling stable communication.
  • FIGS. 3 and 4 are block diagrams explaining configuration examples of the first base station eNB and the second base station eNB, respectively.
  • the sequences described in the first and second embodiments can be achieved with these configuration examples.
  • the following illustrates the case in which a user terminal UE is capable of radio communication with both of the first base station eNB and the second base station eNB.
  • a first base station 100 includes an antenna unit 101 , a modulation and encoding unit 102 , a demodulation and decoding unit 103 , a message creation unit 104 , a synchronization managing unit 105 , a handover deciding unit 106 , a user information managing unit 107 , a routing unit 108 , a data capacity acquiring unit 109 , a user information release unit 111 , and an admission control unit 112 .
  • a reception signal received through the antenna unit 101 is demodulated and decoded by the demodulation and decoding unit 103 .
  • Whether or not the reception signal demodulated and decoded is in a synchronized state is decided by the synchronization managing unit 105 through comparison between an SINR (Signal to Interference plus Noise Ratio) calculated from a known signal such as a reference signal of signal components and its threshold.
  • the value to be calculated may be an SIR (Signal to Interference Ratio) or an SNR (Signal to Noise Ratio), as well as SINR.
  • the message creation unit 104 creates a message (for example, RRC Connection Reconfiguration referred to in 3GPP TS36.300) to be transmitted to the user terminal UE in Step S 07 (see FIG. 1 ).
  • the message is modulated and encoded by the modulation and encoding unit 102 , so that a transmission signal is created.
  • the antenna unit 101 transmits the message by radio to the user terminal UE. Additionally, received is the message (for example, RRC Connection Reconfiguration Complete referred to in 3GPP TS36.300) of Step S 31 (see FIG. 1 ) received from the user terminal UE.
  • the received message is demodulated and decoded by the demodulation and decoding unit 103 , and then, is subjected to the decision as to whether the reconfiguration of communication has been completed normally. This decision is made by a radio control unit RRC/RRM (Radio Resource Control/Radio Resource Management).
  • the radio control unit RRC/RRM includes at least the message creation unit 104 .
  • the radio control unit RRC/RRM includes the handover deciding unit 106 and the data capacity acquiring unit 109 in addition to the message creation unit 104 .
  • the radio control unit RRC/RRM may be configured without including the handover deciding unit 106 and the data capacity acquiring unit 109 .
  • the radio control unit RRC/RRM may include the synchronization managing unit 105 .
  • the handover deciding unit 106 decides in Step S 03 (see FIG. 1 ) whether to perform a handover to the second base station eNB on the basis of the size of data capacity.
  • the handover deciding unit 106 notifies the second base station eNB of the handover request of Step S 04 .
  • the user information managing unit 107 notifies a second base station 200 of UE context information for use in the creation of user information (UE context create) on the second base station eNB side.
  • Step S 17 Triggered by receipt of the notification (for example, Release Resources referred to in 3GPP TS36.300) of Step S 17 (see FIG. 2 ), the user information release unit 111 releases the user information (see Step S 18 of FIG. 2 ).
  • the routing unit 108 transmits and receives the notification on the routing configuration to and from the core network MME/S-GW side.
  • the second base station 200 includes an antenna unit 201 , a modulation and encoding unit 202 , a demodulation and decoding unit 203 , a message creation unit 204 , a synchronization managing unit 205 , a download completion monitoring unit 206 , a timer monitoring unit 207 , a routing unit 208 , a user information managing unit 209 , a user information release unit 211 , and an admission control unit 212 .
  • a reception signal received through the antenna unit 201 is demodulated and decoded by the demodulation and decoding unit 203 . Whether or not the reception signal demodulated and decoded is in a synchronized state is decided by the synchronization managing unit 205 , similarly to the synchronization managing unit 105 .
  • the message creation unit 204 creates a message (for example, RRC Connection Reconfiguration referred to in 3GPP TS36.300) to be transmitted to the user terminal UE in Step S 27 (see FIG. 1 ).
  • the message is modulated and encoded by the modulation and encoding unit 202 , so that a transmission signal is created.
  • the antenna unit 201 transmits the message by radio to the user terminal UE. Additionally, received is the message (for example, RRC Connection Reconfiguration Complete referred to in 3GPP TS36.300) of Step S 11 (see FIG. 1 ) received from the user terminal UE.
  • the received message is demodulated and decoded by the demodulation and decoding unit 203 , and then, is subjected to the decision as to whether or not the reconfiguration of communication has been completed normally. This decision is made by the radio control unit RRC/RRM.
  • the radio control unit RRC/RRM includes at least the message creation unit 204 .
  • the radio control unit RRC/RRM includes the synchronization managing unit 205 , the download completion monitoring unit 206 , and the timer monitoring unit 207 in addition to the message creation unit 204 .
  • the radio control unit RRC/RRM may be configured without including the synchronization managing unit 205 , the download completion monitoring unit 206 , and the timer monitoring unit 207 .
  • the download completion monitoring unit 206 identifies the presence or absence of the notification (whether download has been completed) of Step S 94 based on the contents of the decoded reception signal. Trigged by a decision that the notification of S 94 has been received from the user terminal UE (deciding that a download has been completed), the download completion monitoring unit 206 requests a handover from the first base station 100 (notifies the first base station 100 of a handover request, see Step S 24 of FIG. 1 ) without deciding whether to execute a handover.
  • the timer monitoring unit 207 monitors, using a timer (UE context Release timer described above), whether a certain period of time has elapsed since the reception of the affirmative response of Step S 16 from the core network MME/S-GW.
  • a timer UE context Release timer described above
  • the timer monitoring unit 207 decides that the timer has expired and then notifies the user information managing unit 209 that the timer has expired.
  • the user information managing unit 209 requests the first base station 100 side to release the user information (notifies UE context release), as described in Step S 17 (see FIG. 2 ).
  • the timer monitoring unit 207 stops the timer. This causes the download completion monitoring unit 206 to notify the first base station 100 of a handover request (Step S 24 ) while a release of the user information is not requested.
  • the routing unit 208 transmits and receives the notification on the routing configuration to and from the core network MME/S-GW side. Specifically, the routing units 208 and 108 notify the requests in Steps S 12 and S 32 above, and the affirmative responses of Steps S 16 and S 36 are notified to the routing units 208 and 108 .
  • Step S 37 Triggered by receipt of the notification (for example, Release Resources referred to in 3GPP TS36.300) of Step S 37 (see FIG. 1 ), the user information release unit 211 releases the user information (see Step S 38 of FIG. 1 ).
  • the notification for example, Release Resources referred to in 3GPP TS36.300
  • the user information release unit 211 releases the user information (see Step S 38 of FIG. 1 ).
  • the admission control unit 212 creates the user information (UE context create) using the UE context information notified from the user information managing unit 107 .
  • the affirmative response (Step S 06 ) to the handover request is notified to the first base station 100 .
  • the affirmative response is transmitted to the message creation unit 104 via the antenna unit 101 and the demodulation and decoding unit 103 , so that the message to be transmitted to the user terminal UE (Step S 07 ) is created.
  • the admission control unit 112 receives the handover request (Step S 24 ) from the second base station 200 , thereby creating the user information (UE context create) using the UE context information notified from the user information managing unit 209 .
  • the affirmative response (Step S 26 ) to the handover request is notified to the second base station 200 .
  • the affirmative response is transmitted to the message creation unit 204 via the antenna unit 201 and the demodulation and decoding unit 203 , so that the message (Step S 27 ) to be transmitted to the user terminal UE is created.
  • the user information managing unit 209 notifies the first base station 100 of the UE context information for use in the creation of the user information (UE context create) on the first base station 100 side. This notification, however, is not made when the completion of the download in Step S 94 is notified before the expiration of the timer (because the first base station 100 has not released the user information).
  • the technology according to this embodiment contributes to the realization of the technologies described in the first to fourth embodiments.
  • first base station eNB
  • 106 handover deciding unit
  • 109 data capacity acquiring unit
  • 200 second base station (eNB)
  • 206 download completion monitoring unit
  • 208 routing unit
  • 209 user information managing unit
  • UE user terminal
  • MME/S-GW core network.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
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